A heavy RC paper, semi-matte, will have a higher contrast and is more stable in its dimensions. Surface better protected to scratching and air pollution. The more with a thin layer of satin varnish. Epson Proofing White Semi-Matte 256 gsm? If matte art papers are used apply a varnish like that too on both sides.
Met vriendelijke groet, Ernsthttp://www.pigment-print.com/spectralplots/spectrumviz_1.htm
December 2012, 500+ inkjet media white spectral plots.